Pump, compressor, or the like



v. w. MALMSTROM PUMP, COMPRESSOR, OR THE LIKE Filed May 19, 1926 5Sheets-Sheet l Lvgmm 4/ /40 zlwvznto'c Ilalm 5 Tm: m

attoz waif Sept." 13, 1927. ,454

V. W. MALMSTROM PUMP, COMPRESSOR, OR THE LIKE Filed May 19. 1192s 5Sheets-Sheet 2 amulet,

Vat-LE) W Malmstrum 1,642,454- p v. w. MALMSTROM PUMP, COMPRESSOR, ORTHE LIKE Filed May 19. 1926 5 Sheets-Sheet 5 stantially on the line 2-2of, Figure l thru one of the shafts of the improved device;

Patented Sept. 13, 1927.

UNITED STATES 1,642,454 PATENT OFFICE.

vamo w. mnus'rzaom, or BAYONNE-NEW JERSEY.

ruur, courn'nsson, on rm: LIKE.

Application filed May 19,

This invention relates to improvements in apparatus for the pumping offluids, either liquid, air or gaseous, and which may be utilized as-apump or compressor in the 5 preferred instance, but which by a reversalof the fluid when the sameis acting as a pressure medium may provide amotor or prime mover for operating any suitable mechanism.

The primary object of this invention is the provision of an improvedmechanism, such as a pump, compressor or the like, which embodies anovel rotary pumping having a plurality of vanes a apted to oooperate"in. novel manner with certain sta- .tionary parts of the mechanism forefiecting a continuous and well regulated suction or' flow'of fluidthrough the housing.

A further object of this inventlon is the 2 provision of an improvedrotary type of 'pump or compressor, comprising a balanced arrangement ofrotary pumping units by which to most effectively eliminate end thrustupon a rotary shaft and bearings.

A further object of this invention is the provision of a rotary t e ofpump, compressor, or motor, embodying a pan of shafts u hn each of whichare supported a palr oi rotors, the rotors of'one shaft cooperating inan intermeshingrelationwith the'rotors of the other shaft; free ofcontact with each other and cooperating in a novel relationwithstationar details of, the housing, to ;prevent leak o the operatingmedium or the 85 medium being pumped. 1

.A further object of his invention isthe provision of a rotary type ofpump or com ressor, embod g a compact arrangement y reason of tl i enovel formationpf rotor Other objects and advantages of this inventionwill be apparent during the course of the. following etaileddescription. In the accompanying drawings, forming a art of thisspecificatiornand wherein simiar reference characters designatecorresponding parts throughout. the several'views, Figure 1- isavertical sectionaLview taken longitudinallythrough the improved device.

Fi ure 2 1s a sectional view taken-subshowing the details'thereof.Figure 3'is a horizontal sectional view taken thru the improved'device,along an upper shaft, substantially on the line 8-3 ;by any suitablefluid medium.

1926. Serial No. 110,275.

of Figure 1, sh'owin coo eratin housin and rotor details. g p g g Fi re4 is a sectional view taken. substantially on'the line 44 of Figure 3.Figure 5 is a sectional view similar" to Figure 4, showing a .difierentarrangement of the rotor vanes than that illustrated in Fi re 4. a

lgures 6, 7 and- 8 are sectional views taken substantially on theirrespective lines n Figure 1 of the drawings.

Figure 9 is a perspective viewof a supporting core embodied as a part ofthe improved device. p p liligure 10 is a perspective, view of a rotoruni Figure 11 is a perspective view of another rotor unit of theimproved device.

' F1gure. 12 1s a perspective view of supporting core different thanthat illustrated upper and lower-shafts C and D. e'u'pper shaft 0preferably rotatably supports rotor umts E and F in. the housing B, forpum mg cooperation -with the units G and respectively, which are carriedby the lower shaft p.

Wh1le the. specification and'claims of this appl cation a pump,compressor, or motor ma be specifically referred to, it is compriseastatlonary housing B, rotatab y su porting .tobe 'distmctly understood.that such terms are usedonly'for the purpose of giving nomenclature tothe parts, and are-not to be construed in a limiting sense, sincethe..im-' proved apparatus ma be utilized for the purpose 0 pumpingquick as well as air.

or uses; may beused as a compresaorfor flui s;' or may be 'used as amotor, operated 'I he-houeing'B ferably amam body portion tom arcuatedwal s. 21 $110.22, struck from top and botthe centers on whichthe'shafts G and are supported in the housing B, and providing ,acompartment 23 in the body portion'be tween said walls 21 and 22,wherein the four rotor units E and F, G and H are rotatably mounted onthe shafts C and D, as will be subsequently described. As beforementioned the main body portion is open at the opposite side thereof,and along the marginal edges at said'sides, the body portion 1s providedwith the outwardly extending attaching flanges 25 and 26, adapted todetachably receive bolts 27 for the securing of end plates 30 and 31over said open ends of cooperate, as wi be subsequently described. Ofcourse, this web 34 is provided with su1table openings therethrough forreceivin the shafts G and D and other features 0 the improved device, asis well illustrated in Fi ure 1 of thedrawings. I

t diametrically opposed sides of the compartment of the main body 20 thelatter'is provided with upwardly sloping tubular extensions 36 and 37,having lnlet ports or passageways 38 and 39 respectively therein,

which slope downwardly fromthe outer ends of the extensions 36 and 37,for communication at the lower ends of said assagewa s with thecompartments 23" an 23 in t e housing B, as is illustrated in Figures 3and 6 of the drawings. As is illustrated in Figure3 the web 34 at eachside of the housing asses across the passageways 38 and 39, to

ivide each of said passageways or ports immediately at the entrance ofthe same to the compartments 23' and 23", so that the fluid mediumentering the passageway 38, .will be divided at 41 and 42 as illustratedin Figure 3 of the drawings, for flow into the compartments 23" and 23respectively, and likewise at the passageway 39 the web portion'34divides the said passageway into portions 43 and 44 for the compartments23' and- 23 respectively; The upward slope of the pamageways 38 and 39from their communication with the com artment of the housing, asillustrated in Figure 6, provides an important feature in connection.with the tra of certain liquid medium therein, when suc is being used asan operating medium or as a medium which is being operated upon,

to permit the settlement of such liquid to cross thintermeshing zone ofthe rotors of the upper and lower shafts, to obviate the ings. Thebracket arms 48 and '49 are prefflerably integral with theplatrs 30and-3l,

extending horizontally outwardly therefrom at the upper and lower endsof said plates 30 and 31, and the bracket members 46 and 47 areelongated and at their ends secured in.

detachable relation by screws or bolts 50 to said arms 48 and 49. Eachbracket member 46 and 47 supports a pair of the anti-friction bearings45, which may be of the roller bearing or ball hearing as illustrated.Each of the bracket members 46 and 47 for the accommodation of-eachanti-friction bearing v 45 is recessed inwardly of its outer side toprovlde a bearing pocket 52 over which detachable closure caps 53 may besecured at the outer sides of the bracket members 46 in ggder to sealthe bearings within the pocket Each bearing 45 preferably comprises anouter race 56 mounted rather loosely in the pocket of the bracket member46 or 47, as the case may be,and an inner race 57 snugly mounted on therespective shaft C or D;

anti-friction members, such as balls 58 being placed between the saidinner and outer races in order to support the ends of the shafts C andD- in an anti-friction relation with respect to the housing B, as canreadily be understood from Figure 1 of the 1 drawings.

It is preferred to adjust the shafts C and,

D longitudinally in order to properly position the rotor units E, F, Gand H, which are keyed with said shafts. To this end the shafts C and Dimmediately outwardly of the bearings 45 are screw threaded at 60,

for adjustably receiving-nuts 61 thereon, so

that by adjustment of the nuts 61 against the inner races of theanti-friction bearing 45, the-shafts C and D may be longitudinal liyadjusted in the housing, to the desired egree to best position the rotorunits E, F, G and H, so that they will bear ,vvith the least frictionalengagement with. the housing B. The nuts 61 it should be noted are alsolocated in the compartments which enclose the bearings 45, sot-hat thecaps 53 must be removed in'order to adjust the nuts 61 and consequentlythe shafts C and D.

The upper shaft 0 extends thru the upper portion of the compartment 23,on an axis located above the inlet' and outlet passageway portions 41 to'44 inclusive, and

this shaft has rotatably keyed therewith the rotors E and-F at oppositesides of the web -ments.23 and 23 and of course at opposite sides' ofthe web 34; said rotor units respectively cooperating with cores 75 and76 which are stationary with the housing B and located'in the lower.portions of the compartment 23 and 23 in the relation of parts to besubsequently described. indetall. Referring to the rotor units E and F ewhich are carried by the shaft C in the upper parts of the compartment23 and 23 respectively, each of said units is of the form illustrated inFigures 1 and 10 'of the drawings, comprising" a ring-shaped hub portion80, having a. passageway 81 therethrough for receiving the reduced end82, of the shaft C; a key groove 83 being provided along the passageway81 for receiving a key 84 by means of which to key the rotor unit uponthe'shaft C. At one endof the hub portion 80, the same is annularlyflanged outwardly at 85 in an integral relation, and projecting fromtheop ositeside of the flange 85 with respect to ta hub, 80

are provided segmental shaped'vanes 86 and 87, in uniformcircumferentially spaced relation about the axis of the rotor; saidvanes 86 and 87 being preferably at exactly diametrically o posedlocations with respect to the axis of rotation of the rotor unit; andthe opposite edges 88 of said 'vanes 86 and 87 being disposed in planesradial with respect'to the axis'of rotation of the rotor unit, and asillustrated in Fig- .ure 6 of 'the drawings. It is to be noted that thesaid vanes 86, and 87 are of segmental form in cross sectiontransversely of the axis of rotation, and each of said. vanes being ofuniform thickness at any location thereon, providing outer convexsurfaces and inner concave surfaces, which are respectively adapted tocooperate 1n a shdmg lsealed relation upon the inside surfaces of thewalls of the housing B and the exterior convex surface of the core 70.

The core 70, has been detailed in Figure 9 of the drawings, and. thes'ame'comprises an elongated tube formed-intermediate its ends with anannular integral flange 90, to divide the same into end tubular portions91 and 92 at opposite sides of the said flange 90; the former being thelonger. The web 34 in the u per portion of the compartment 23 isprovided with an opening 93 therethrough and it is recessed at 94inwardly of the side which faces the compartment therewith core '70,which is bolted in place to the housing B by means of bolts 100 securedto the web 34 as illustrated in' Figure '1. The

longer tubular portion 91' of course extends thru the opening 93 andprojects int-o the upper portion of the compartment 23' where the sameextends between the vanes 86 and 87; the latter at their facing concavedsides preferably bearing on the portion 91 in a fluid sealed relationthereon.

The shaft C of course extends thru the passageway 97 of the core 70. Theportion 92 of the core extends at the opposite side i of the supportingweb 34 from the core portion 91, and projects into the space between thevanes 86 and 87. of the rotor unit F; the

vanes at their concave sides bearing on the portion 92 in a fluid sealedrelation thereon.

An important feature in the placement of the rotor 'u'nits E and F isthe fact that their hubs'80 rotatably extend into" openings 98 "providedin the end plates or walls 30 and 31 of the housing B, and the outersides of said hub portions are thus exposed at the outer sides of theend walls 30 and 31, for receiving suitable sealing ring constructions101 by means of which to seal thebearing juncture of the rotors E and Fon the end walls 31 and 32, and which sealing ring, constructions 101will scribed.

The provision of the hubs'80 at the o posite sides of the body portionof t e rotor units E and F from the vanes 86 and 87 enables a properthickness of hub to be provided in a non-interfering relation with thev'anes; the laterincident to such construction being placed as-closetogether as posslble, so that a very compact rotor unit is providedwhich may attain maximum efiicieney. without considerable bulk.

Spacmg sleeves 105 are rovided about the shaft ends 82 between t ehubs80 and the bearings 45 adjacent thereto. j

The rotor unit G in the .lower portion of be subsequently dey thecompartment 2 3" is preferably integral mental in formation, and. whichare uniformly spaced circumferentially of the rotor for the samedistance. These segments 107 and 108'are' of the same formation as thevanes-or segments .86 and 87 and preferably of the same thickness, havinouter convex sides and inner concave si es respectively in slidingabutment with the inner walls of the housing B and the outercircumference of the supporting core 75 which is illustrated in Figure12 of the drawings as a detail. It is to be thus noted that the shaft Dreally constitutes the hub portion for the rotor G, since the hub 109 ofsaidrotor G is really rigid or integral with the shaft D. V

The rotor H is detailed in Figure 1]. of the drawin s and comprises asubstantially ring-shaped? or disc-body portion. 110, having a centralopening 111 therein for receiving the shaft D'therethrough; this discportion. 110 being adapted to abut up against the opposite side of theweb 34 from the rotor unit G, and having openings 112 therein forreceiving bolts 113 by means of which the said rotor unit H may beconnected in the hub portion 109 of the rotor unit G, to rotate therotor units G and H together upon rotation of the shaft D, as is readilyapparent from Figure 1 of the drawings. The rotor unit H includes thesegmental vanes 115 and 116, which are diametrically disposed in auniformly spaced relation circun'iferentially of the rotor, and whichhave outer convex and inner concave facing surfaces.

As is illustrated in Figure 12 of the drawings, each of the supportingcores 75 and 76 includes a substantially cylindrical shaped portion 115having a passageway 116 therein, which receives the shaft Dtherethrough; this tubular portion 115 at an end thereof being providedwith a laterally extending segmental flange 118, adapted to abut againstthe inner side of the end wall 30 or 31,-as the case may be; the flange118 being provided with transverse openings 119 for receiving bolts orscrews 120 by means of which the said supporting cores 75 and 76 areconnected in a stationary relation with the housing B, in the lowerportions of the compartments 23 and 25 respectively, so that theconcaved surfaces of the vanes 107 and 108 of the rotor unit G- slidablybear on the outer surface of the portion 115" of the core 7 5, and theinner concave surfaces of the vanes 115 and 116 of the rotor H slidablybear on the outer circumference of the cylindrical portion 115* of thecore unit 76.

In referring to the cooperative relation of the rotor units E and G inthe compartment 23, it is to be noted that the vanes of said units facein opposite directions from their respective hub portions, and the-vanesof the rotor units E and G intermesh, that 18, the vanes of the unit Eenter the spaces between the vanes of the unit G during the rotation ofsaid units, due to rotation of the shafts C and 1).; The vanes of saidunits E and G in arcuation are referably 75 of a circle, more or less,so t at it be seen that during the rotation of the rotors in thecompartment 23', the end s1n-- faces of-the vanes of the two rotors willrotors.

eeann;

be spaced from each other, as is clearly evident from Figure 6 of thedrawings.

The cylindrical shaped portion 91 of the supporting core longitudinallyat a side thereof is grooved or recessed at 120, to provide a concavesurface, which is struck from a radius equal to the radius from thecenter of the rotor Gr to the outer convex surface of the vanes 107 or108, and. which cavity 120 inwardly of the outer. convex surface of ,thetubular portion 91 of'the core 70 is for the purpose of receiving thesegmental vanes 107 and 108 of the rotor G therein during the rotationof the said rotors E and G in the compartment 23", to provide aneffective sea-l during the rotation of said In similar manner the outerconvex circumference of the cylindrical portion 115 of the core memberis concavely recessed at 125 longitudinally thereof; the concave surfaceof this recess 125 being struck upon a radius which is equal to theradius from the center of the rotor E to the outer surface of one of thevanes 86 or 87 of the same, and so that the outer surfaces of said vanes86 and 87 may slide over the concave surface of said recess 125 duringthe rotation of the rotors E and G, to rovide an effective seal toprevent loss of uids. By so recessing the core portions upon which therotors E and G operate a surface seal is provided during the rotation ofsaid rotors, which pres vents communicating pressure between theentrance and exit ports of the housing B, and

insures that the pumping or operating efficiency of the rotors iscontinuous and not intermittent. v

The core portions 92- and 115 ,of the supporting cores 70 and 76 areprovided with' longitudinal recesses or grooves 127 and 125 therein inmanner similar to the grooves of the supporting cores as abovedescribed, for similar cooperation with the vanes of the rotor units Fand H, for providing a fluid-tight seal between the entrance and exitports of the compartments 2%) wherein said rotor units F and H operatein a cooperating relation.

It is to be noted that the end thrust due to the pumping of fluid willtake place in both directions oneach of the shafts C and D, due to thefact that each of said shafts supports a pair of the rotor units whosethrusts are in opposite directions along the shafts, and thus comensating and obviating the necessity of t irust bearings.

The princi 1e of this invention in connection with on y a pair of themeshing? rotor units is preferably feasible, and the double revision ofrotor units on each shaft may be dispensed with, since this is merelypro vided for a pump with large capacity, or considerable power, or incase where and thrust bearin need not be provided.

The shafts C and D' are connected for synchronous drive at the samespeed by means of gears 130 and 131 keyed thereon; said gears being ofthe same size and in meshing relation at one end of the housingexteriorly' of the supporting bracket memrotor units E and F, thespecial type of sealing ring construction 101 is provided, whichcomprises a ring portion 135 bolted at 136 to the outer surface of eachof the end walls and 31, circumferentially about the shaft C; said ringportion 136 providing an,

inwardly facing annular flan e 137, against which the outwardly facingedge of a spring urged ring 138 engages. The spring urged ring 138 is ofthe formation illustrated in opening 98 of the end wall ofthe housing,

Figure 13 of the drawings, being reciprd cably received within asuitable annular groove formed inwardly of the outer surface of the endwalls 30 and 31, concentric with the shaft C; said rings 138havingbarrel shaped projections 140 thereon with sockets 1 41 therein openingonly at the sides which face the bottom of the grooves 144 in whichwhich the ring 138 is provided. In these sockets 141 compressed springs145*are, provided, which at one end engage the end walls 30 or 31 asthe-casemay be, and at the o posite end engaging against the end wa sprovided by the sleeves 140 of the ring 138, to force the latteroutwardly into margin abutting relation with the annular flange 137which is rigid with the housing B. A pin 146 is keyed or rigid with therotor E or F, as the case may be, and enters one of the sockets 141 tocause a rotation of the sealing ring member 138 with the rotor. Due

to the fact that the ring portion 135 is attached at the outer side ofthe mounting of the hub 80, which has a sliding fit in the and the ringportion 138 is at the opposite side of said mounting, leak ofcompression past the bearing of the hub portions of the rotors E and Fon the housing B is prevented.

In order to prevent leak ofcompression along the shaft D outwardlybeyond the ends of the rotors G and H and beyond the apertures in thewalls 30 and 31 thru which the shaft 1) extends, sealing ringconstructions grooves provided inwardly of the outer surfaces of the endwalls 30 and 31; said ring portions 141 being spring urged and of thesame general construction as the ring port'ions 138 above described, andat their outer annular edges being urged into sealing engagement withthe annular edges of rin I the drawings; said spacing sleeves being"disposed about the reduced ends of the shaft D.

As to operation, if the passageway 38 is usedas an inlet, the rotorswill operate'as illustrated in Figures 4 and 5 of the drawings, to drawthe medium thru the ,inlet 'port 38;*the chisel edge of the web portion34 which faces in the passageway 38 dividing the stream of the fluid sothat it will flow into thepassageway ports 41 and 42 into each of thechambers'23 and 23, due to the operation of the intermeshing vanes ofthe rotary units in each of said compartments 23 and 23?. It-is to benoted that the width of the vanes are substantially smaller than thewidth of-the spaces in which they mesh,- so that the end surfaces of'theintermeshing vanes are in spaced relation and they may be flat, radial,or any shape desired, so that for the purpose of providing a sealbetween the inlet and outletports of the improved pump 0r compressor, itis not important to have the end surfaces of the vanes of theintermeshing rotors in sliding or any other engaging relation, and thisis very important, since very often foreign materials have a tendency toass thru themechanism and if the end surfaces of the vanes are inabutting relation, the foreign materials very often metal, will cause awedging and possibly breaking ofthe parts of the rotors, and even partsof the housing.

The vanes of the rotor units fit snugly against the adjacent stationaryparts of the housing B and cores at the centers of said rotor units, andthe said rotor vanes due to the cooperationof the same on the cores ofthe complement rotor, do not meet anyother sealing gaskets or means,since surface Sealthe inlet and outlet ports, yet the spacedintermeshing of the vanes permits of an efficient draft thru thechambers of the housing, for sucking air or other fluid medium from the'intake for discharge thru the exit ort. p The fact that the rotor unitsof the shaft D are assembled to a common disc with vanes facing inopposed directions, andas the complement double rotor of the shaft C hasthe vanes facing inthe same direction, a very compact rotor constructionfor the improved device is provided, which tends towards coming-contactis effected at all times between pactness and eificiency in operation,as well as ease of assemblage and disassemblage of parts.

The improved mechanism is very-durably constructed, without delicateparts, to serve as a prime mover, pump, compressor or the like, and thesame is ideal for the pumping of fluids of great viscosity.

The fact that the vanes of the rotors are equi-distant andcircumferentially spaced about the hub or body portion of therotorinsures that the rotor will be effectively balanced both statically anddynamically, during rotation, doing away with all eccentric tendencieswhich are apt to cause vibration and leak of the fluid operating or eingoperated upon. The places where leakage 1S to be expected between thehousing or stationary parts and revolving parts are equipped with thespecial seal rings which are preferably made of metal or other materialto provide an .efiicient seal, and these rings have a spring take uparrangement to compensate for wear. Whatever compression does leak pastthe vanes, in the nature of air, gas'or liquid, will pass thru suitableconduits 150, which are connected with ducts which communicate with thespaces nearest to the seal rings; said-conduits being connected at theiropposite ends with the suction passageway of the improved device, toprevent loss of the medium being operated u on.

The fact that the vanes are not in contact obviates the requirement ofmachining the same, nor does any fine adjustment of rotors have to beeffected;

The fact that the end brackets 46 and 47 are detachable, enables allparts of the mechanism to be readilydetachable from opposite ends of thehousing B, as is readily apparent.

, or minor longitudinal adjustments of the shafts G and D, clearances offrom three to six thousandths of an inch may be provided between thehousing and end surfaces of-the rotor. The bearing caps 53 are providedwith annular pilot rings 53 which bear against the outer edges of theouter races of the ball bearing to hold the shafts and rotors againstaxial movement. It is apparent that by adjusting the bearing ca 53,which may have some clearance with respect to the adjustment bracket ofthe housing, the outer races may be adjnstedtotake u any end lay of theshaft and to pro cry a just t e same with respect to the ousing androtors.

Various changes in the shape, size, and

arrangement of parts may be made to the form of invention herein shownanddescribed, without departing from the spirit of the invention or thescope of the claims.

I claim: 1 In a device of the classdescribed the means i combination ofa housing having a compartment therein provided with inlet and exitports, a pair of shafts rotatably mounted on the housing to extend thrusaid compartment, individual stationary cores carried by the housingconcentrically about each of said shafts and within said compartment,and a rotor keyed for rotation with each of said shafts, each of saidrotors includinga plurality of vanes, with the vanes of one rotor in acomplementary intermeshing relation with the vanes of the other rotor,the outer surfaces of the vanes and the cores being formed to provide asealing surface contact between the intake and exhaust ports duringrotation of-said rotor.

2. In'a device of the class described the combination of a housinghaving a compartment therein, a phirality of shafts 1o tat-ablysupported by the housing extending thru the compartment, said housinghaving intake and exhaust ports to the compartment, a stationarysubstantially cylindrical shaped core carried by the housing about eachof said shafts and extending trans- 'versely across said compartment,each of said cores having a grooved depression inwardly thereoffacing'the other shaft core, the said groove depressions being disposedtransversely of the compartments and being arcuated so that the centerof arcuation of the depressions of each of said cores is concentric withthe shaft on which the other core is mounted. and'rotor units rovtatablysupported in the housing with vanes extending into said compartment in afluid sealed relation, the vanes of one unit being adapted to alternatewith the vanes of the other rotor during rotation of said rotors and theouter surfaces of the vanes being convex and adapted to slidably passthrough the depressions of said cores during rotation to provide a fluidseal between the intake and exhaust -ports.

3. In a device of the class described thev combination of a housinghaving a compartment therein, a plurality of shafts rotatably supportedby t e housing extending thru the compartment, said housing having inletand out-let ports to the com artment. sta tionary substantially oylinrical shaped cores carried by the housing about each of said shafts andextending transversely across said compartment, each of said coreshaving a grooved depression inwardly thereof facing the other shaftcore, the said groove depressions being disposed transversely of thecompartments and being ardepressions of each of said cores is concentricwith the shaft on which the other core is mounted, and rotor unitsrotatably supported in the housing each havin a pair of spaced vanesextendin into said compartment in a fluid sealer? relation, the vanescuatedso that the center of arcuation'of the Y of each unit beingadapted to alternate in non-engaging relation with the vanes of theother rotor during rotation of said rotors, the outer surfaces of thevanesbeing convex and adapted t sIidably pass through the depressionsofsaid cores during rota-- tion to rovide a fluid seal between theinlet' and out et ports.

4. In a rotary device of the class 'described the combination of ahousing having a a sair' of compartments therein, and inlet outlet portopenings for each compartmerit, a pair of shafts rotatably supported bythe housing extending thru each of said compartments, in a spacedrelation, a rotor mounted on each shaft in each compartment,

the rotors of the shafts in each compartment having vanes thereon ofsubstantially segmental formation and adapted to alterate in a meshingnon-engagin relation during rotation of the same in t eir compartment tocreate a suction in-the compartment for drawin fluid from the inlet portand discharging it through the outlet port, the rotors of eachshafthaving the va'nes' thereof positioned to place the end thrusts onthe shaft in opposed directions to counter balance any end thrusts uponsaid shaftsi In a; rotary device of the class described the combinationof a housing having a pair of compartments therein and inlet and outletport means for each compart ment, .a pair of shafts rotatably supportedby the housing extending thru each of said. compartments, in a spacedrelation, a rotor mounted on each shaft in each compartment,-the rotorsof the shafts in each compartment having vanes thereon of substantiallysegmental formation and adapted to alternate in a ,meshing non-engagingrela-- tion during rotationof the same in their compartment to create asuction in the compartment for drawing fluid from the inlet port meansand discharging it through the outlet port means, the rotors of eachshaft having the vanes thereof positioned to place the end thrusts on te shaft in opposed directions to-counter alance any end thrusts uponsaid shaft, and anti-friction means rotatably supporting said shafts insaid housing for longitudinal adjustment tomove the rotors to aipredetermined extent across their respective compartments.

6. In a rotar device of the class described the combination of a housinghaving a compartment therein, and inlet and outlet port means to thecompartment, 'a shaft rotatably supported in the housing having means tolongitudinall adjust the shaft across the compartmen, a rotor keyed onthe shaft at an end of the compartment having segmental shaped vanesextending into the compartment, a second shaft, means mountin the secondshaft in the housing for longitudinal adjustment thru the compart havingvanes laterally extending therefrom of segmental formation adapted tointermesh 1n the spaces between the vanes of the other rotor duringrotation of said shafts and rotor's, the vanes bein so positioned thatthey face in opposite irections from their respective locations ofattachment upon their shafts. i-

7. In a rotary device of the class demribed a housing having acompartment therein and inlet and outlet ports to thecompartment, a pairof shafts, means rotatably mounting said shafts on the housing forsubstantially parallel extension thru said compartment, rotors keyeduponeach of the shafts, each of thetrotors havlng a hub por- I tion andspaced vanes extending from a side of the hub portion substantiallyparallelwith the respective shafts, the vanes of one rotor being adaptedtoenter between the liquid seal rin construction carried by the shaft ofthe ot er rotor and the housing to prevent leak of fluid from thecompartment past the ends of said rotors and shafts.

8 In a rotary-pump the combination of a 10 supporting housing having acompartment therein and inlet and outlet ports to the compartment, apair of shafts rotatably supported bythe housing extending thru the comartment, a pair of rotors keyed on each 1 of t e shafts in the comartment, the said rotors of each shaft aving segmental shaped vanesextendingin opposite directions longitudinally of the shaft from theconnections of said rotors on the shafts, the

rotors and vanes bein so positioned that the vanes of the rotors of oneshaft alternate in the spaces between the vanes of the rotors of theother shaft during rotation of said shafts, and means cooperating withsaid rotors and the vanes thereof to provide a fluid seal between theinlet and outlet ports upon rotation of the rotorsand shafts.

9. In a rotary pump of the class described the combination of asupporting hofusing having a compartment therein and inlet and outletport means therefor, shaftsrotatably supported by the housing andextending into said com artment, rotors keyed on each, of the shafts ina rotary relation within the compartment of the housin each of saidrotors including vanes with t e vanes of one shaft alternating in theaces between the vanes of the rotor of anot er shaft, and seal taryparts of the shaft and rotor to prevent leak of fluid pressure from thecompartment.

10. In a. rotary pumpof the class described the combination of asupporting housing having a compartment therein and inlet and outletport means therefor, shafts rotatably supported-by the housing andextending into said compartment, rotors keyed on each of'the shafts in arotary relation within the compartment of the housing, each of saidrotors includin vanes with the vanes of one shaft alternating in thespaces between the vanes of the rotor of another shaft, seal ringssupported by the housing and the rotary parts of the shaft and rotor toprevent leak of fluid pressure from the compartment, and spring meanscooperating with said seal rings'to-normally maintain them effective andto compensate for wear thereon. a

11. In a rotary pump the combination of a housing having a compartmenttherein and inlet and outlet ports, a pairof shafts rotatably supportedby the housing extending into the compartment thereof, rotors rotatablysupported by the housing and shafts having spaced vanes thereon with thevanes of one rotor of one shaft cooperatingin the space between thevanes of the rotor of the other shaft, thevanes being so disposed thatduring rotation of the rotors they will create a suction in thecompartment for drawing fluid from the inlet port and passing itthroughout'the outlet port of the com partmcnt, and sealing means at thejuncture of the rotary partsof the rotors andjshafts with the stationaryparts of the housing, each of said sealing means comprising a stationaryring carried by a stationary part of the housing and a'rotary ring keyedto the rotary part of the housing, and spring means cooperating to forcethe said stationary and rotary rmgs of the sealing means into a sealingengagement at all times.

l2.v In a rotary pump the combination of a housing having a compartmenttherein and intake and discharge passageways communitating intermediatethe upper and lower ends of the compartment, said passagewa 's slopingfrom their communication with'tie compartment in adirection upwardly tothe outer ends of said passageways remote from the compartment, wherebyto provide inlet and outlet ports in substantially horizontal ali nmentintermediate the upper and lower en s of said compartment, a pair ofshafts rotatably carried by the housing in superposed relation acrosssaid compartment, a rotor rotatably carried by one shaft in the newnessbeing in alignment with inlet and outlet] communication of the portswith the compartment.

13. In a rotary pump the combination of.

a housing including a body portion having a compartment therein open atthe ends of the body portion of the housing, a web transverselyextending thru the compartment of the body portion between the open endsof the said body portion to subdivide thecompartment into a pair ofchambers at opposite sides of said Web, cover plates detaohably mountedover the open ends of the compartment to enclose the chambers, shaftsrotatably supported by said cover plates in an anti-friction relation insubstantially parallel relation to each other transversely extendingthrueach of said chambers, a pair of rotors rotatably carried by one ofsaidshafts-each including a hub portion keyed to the shaft at a locationwithin the area of the cover plates, saidrotors having vanes extendingfrom said cover plates inwardly into the upper portions of the chambersof the housing, a stationary tubular core carried by the housing webproviding cylindrical shaped tubular portions extending into each of thechambers at opposite sides of said web into the central spaces between.the vanes of the above mentioned rotors, each of said cylindrical shapedportions of the core having longitudinal grooves therein, a pair ofrotors connected to the other shaft at the web of the bodyportion of thehousing and having spaced vanes extending in opposite directions fromsaid web a into each of the chambers of said body portion of thehousing, cores connected'with the cover plates each includingcylindrical portions extending about the last mentioned shaft in each ofthe chambers between the vanes of the last mentioned rotors, the rotorvanes of one of the shafts being positioned in spaced relation so thatthe same will enter into the spaces between the vanes of the rotors ofthe other shaft during rotation of said shafts, last mentioned coreshaving longitudinal grooves therein, and the vanes of each of the shaftsbeing adapted to slide in a surface and fluid sealing relation acrossthe grooves of the cores of the other shaft during r0- tation of saidrotors and shafts.

VAINO W. MALMSTRUM.

